Tick

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The New York Stock Exchange (NYSE) Tick is a measure of how many stocks are rising in price versus how many are declining in price. An upticking stock is one where the most recent change in price was positive; a downticking stock is one where the most recent change was negative. Tick is calculated by subtracting the number of downticking stocks from the number of upticking stocks. For example, a tick reading of +350 means there are 350 more upticking stocks than downticking stocks.

Tick is recalculated continuously throughout the day. Normal tick levels are between +500 and -500; tick readings of plus or minus 1000 are generally considered extreme. Daytraders often use extreme tick readings to determine short term overbought and oversold conditions.